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CRAS Live Sound Final Cycle 3 Questions with correct Answers
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CRAS Live Sound Final Cycle 3
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CRAS Live Sound Final Cycle 3What are the 3 elements of single phase power? - answerhot
neutral
ground
What are the three elements of 3 phase power? - answerthree hots
one neutral
one ground
What is a ground loop? - answerWhen voltage moves back and forth between ground
via a signal carrying line
What do ground loops cause? - answer60 Hz hum
How do you fix a ground loop? - answerDI box and ground loop switch
What colors are the wires in an xlr cable? - answerground/shield = green
positive/hot = red
negative/cold = black
What colors are the wires in a US outlet? - answerneutral = white
hot = black
ground = green
What do +4dbu and -10dbu represent? - answercommon line level
how much must the resistance of the mic pre be to function at optimal level? - answerIt
must be 10x the mic's output impedance
What is +4dBU in dBV? - answer1.2 dBV
What is -10 dBU in dBV? - answer0.3 dBV
What kind of splitters lose mic signal when they split? - answerdigital splitters
When do pre-fader splitters split? - answerbefore the fader
What happens every time you add a console to an analog split? - answerThe signal to
each console decreases
, What is a VOM and what does it do? - answerVolt Ohm Meter
It measures AC and DC current
What are the four steps to get any channel to any bus? - answer1. bring mic pre to 0dB
2. bring channel fader to 0 dB
3. Bus it
4. Bus fader to 0dB
What do power amps do? - answerBring line level to speaker level
What do pre fader listens do? - answersolos a channel so that the engineer can check
its level with headphones
What do after fader listens do? - answersolo a bus so they can check the level with
headphones
What does a channel EQ do? - answerAdjusts frequency levels to make the channel
sound good
What do 30 band EQs do? - answerTune the speakers to the room
What level do passive crossovers work at? - answerSpeaker level
Do passive crossovers come before or after amps? - answerafter amps
Do passive crossovers create insertion loss? - answerYes
Do passive crossovers have fixed points? - answerYes
What do low pass filter coils do? - answerblock the highs in passive crossovers
What do high pass filter coils do? - answerblock the lows in passive crossovers
What is the crossover point for most passive crossovers? - answer200Hz
What is the function of a crossover? - answerdivide input signal (at line or speaker level)
into two or more discrete band passes
What level do active crossovers work at? - answerline level
How many crossover points do active crossovers have? - answerIt is variable (but
typically 3)
What type of power do active crossovers require? - answerAC power
Do active crossovers have insertion loss? - answerNo
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